Having validated our resummation calculations by comparing their
expansions to the corresponding fixed-order predictions,
we finally present our matched resummed \(\text{NLO} +\text{NLL}  ^\prime \)  results and compare them to their NLO counterparts.
Figs. REF  and  REF 
contain our predictions for the two considered transverse-momentum
slices, using the same set of observables and grooming parameters as
above.
These figures also illustrate how the full result is obtained as the
sum of the two flavour channels — quarks and gluons — identified by our BSZ flavour-assignment
procedure.
We note that, for all observables, the contribution from gluon jets
is increased for the higher \(p_{T,\text{jet}}\)  slice compared to the case \(p_{T,\text{jet}} \in [120,150]~\text{GeV}\) . However, for both slices we observe
a more significant contribution from gluon jets for larger values of the angularities, while the low-\(\lambda ^1_\alpha \) 
tails are entirely dominated by quark jets.
This is a confirmation that a cut on the jet angularity can serve as a theoretically well-defined and IRC safe
quark–gluon discriminant, as pointed out, for instance, in Refs. [1]}, [2]}, [3]}, [4]}.
We leave further investigation on this topic to future work.
In addition to the matched resummation, we show the full fixed-order predictions at NLO accuracy.
All-order effects turn out to be important essentially over the entire observable range.
In particular, only for the highest values of the observables do NLO and matched
predictions start to look similar. This appears to be the case for both ungroomed and groomed distributions.
After a detailed analysis, we have concluded that this effect, the size of which is rather surprising,
is driven by the large constant contribution of Eq. (REF ), which in turn originate from the large
perturbative corrections that characterise the \(Z\) +jets process. Similar observations have been
reported for the groomed jet mass in \(Zj\)  production in Ref. [5]}.
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